Zipfel, J D; Bevington, P; Wright, L; Chalupczak, W; Quick, G; Steele, B; Nicholson, J; Guarrera, V (2024) Indirect pumping of alkali-metal gases in a miniature silicon-wafer cell. Physical Review Applied, 22. 014056

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Abstract

Atom spin sensors occupy a prominent position in the scenario of quantum technology, as they can combine precise measurements with appealing miniature packages which are crucial for many applications. In this work, we report on the design and realization of miniature silicon-wafer cells, with double-chamber configuration and integrated heaters. The cells are tested by systematically studying the spin dynamics dependence on the main pump parameters, temperature, and bias magnetic field. The results are benchmarked against cm-sized paraffin-coated cells, which allows for optimiztion of operating conditions of a radio-frequency driven atomic magnetometer. In particular, we observe that, when indirect optical pumping is performed on the two cells, an analogous line narrowing mechanism appears in otherwise very different cells' conditions. Competitive results are obtained, with magnetic resonance linewidths of roughly 100 Hz at the maximum signal-to-noise ratio, in a non-zero magnetic field setting, and in atomic shot-noise limited regime.

Item Type:	Article
Keywords:	wafer cell, atomic magnetometer
Subjects:	Time and Frequency > Optical Frequency Standards and Metrology
Divisions:	Time & Frequency
Identification number/DOI:	10.1103/PhysRevApplied.22.014056
Last Modified:	14 Jul 2025 10:07
URI:	https://eprintspublications.npl.co.uk/id/eprint/10203